Fig. 3: Relationships between four groups of stream constituents and wetland hydrologic connectivity based on standardized population mean regression slopes from linear mixed effects models.
From: National hydrologic connectivity classification links wetlands with stream water quality
a–d, Mean slope represents the standardized relationship between the constituent and wetland connectivity class averaged across all regions. A filled (dark) circle indicates that the regression slope is significantly different than zero, that is, the regression slope plus or minus the confidence interval (two times the standard error of the slope estimate) does not overlap with zero; points represented by an open (light) circle are not significantly different than zero (Supplementary Table 3). Wetland connectivity for the four classes is NRDeep < NRMid < NRShw < Riparian. For details on the modelling approach, see Methods. Dashed line represents zero intercept. Acidification (a): cond (n = 1,764), Ca (n = 1,787), Mg (n = 1,787), Al (n = 1,180), pH (n = 1,764) and ANC (n = 1,788). Brownification (b): DOC (n = 1,788) and colour (n = 1,786). Eutrophication (c): NO3 (n = 1,338). Sedimentation (d): turb (n = 1,764) and TSS (n = 1,694).
